The effect of support reducibility on the stability of Co/CeO2 for the oxidative steam reforming of ethanol

Silva, Adriana Maria da; Souza, Kátia R. de; Mattos, Lisiane V.; Jacobs, Gary; Davis, Burtron H.; Noronha, Fábio B.

doi:10.1016/j.cattod.2010.10.033

Cited by 75 publications

(53 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The latter, could be possibly related to the strong metal-support interactions, maintaining the Co species in an oxidized state (Co δ`s pecies). This factor could be considered responsible for the adequate ESR performance of Co/CeO 2 catalysts, in agreement with relevant literature studies [42][43][44][88][89][90][91].…”

Section: Discussionsupporting

confidence: 73%

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

et al. 2016

View full text Add to dashboard Cite

Abstract:The aim of the present work was to investigate steam reforming of ethanol with regard to H 2 production over transition metal catalysts supported on CeO 2 . Various parameters concerning the effect of temperature (400-800˝C), steam-to-carbon (S/C) feed ratio (0.5, 1.5, 3, 6), metal entity (Fe, Co, Ni, Cu) and metal loading (15-30 wt.%) on the catalytic performance, were thoroughly studied. The optimal performance was obtained for the 20 wt.% Co/CeO 2 catalyst, achieving a H 2 yield of up to 66% at 400˝C. In addition, the Co/CeO 2 catalyst demonstrated excellent stability performance in the whole examined temperature range of 400-800˝C. In contrast, a notable stability degradation, especially at low temperatures, was observed for Ni-, Cu-, and Fe-based catalysts, ascribed mainly to carbon deposition. An extensive characterization study, involving N 2 adsorption-desorption (BET), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM/EDS), X-ray Photoelectron Spectroscopy (XPS), and Temperature Programmed Reduction (H 2 -TPR) was undertaken to gain insight into the structure-activity correlation. The excellent reforming performance of Co/CeO 2 catalysts could be attributed to their intrinsic reactivity towards ethanol reforming in combination to their high surface oxygen concentration, which hinders the deposition of carbonaceous species.

show abstract

Section: Discussionsupporting

confidence: 73%

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

et al. 2016

View full text Add to dashboard Cite

show abstract

“…2 and 6, and Scheme 1). The relationship between the reducibility of the Rh/CLx catalyst and the La content is in good agreement with that of ethanol conversion and H 2 yield on the corresponding catalyst, revealing the key role of reducible species in the OSR reaction [49]. Still, the detailed mechanism on how the reducible species participate in the ethanol reforming remains unclear, the understanding of which will be the focus of our next research study.…”

Section: Discussionmentioning

confidence: 49%

Hydrogen production from oxidative steam reforming of ethanol over rhodium catalysts supported on Ce–La solid solution

Han

et al. 2013

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

, which is 150 K lower than that required for comparable performance with 1%Rh/ CeO 2 . La doping also enhanced the stability by accelerating CH 3 COCH 3 conversion and gave low CO selectivity due to the high water gas shift activity. X-ray diffraction and Raman spectroscopy characterizations indicate the formation of CeeLa solid solutions and oxygen vacancies. H 2 temperature-programmed reduction and thermo-gravimetric measurement results confirmed that the redox properties of Rh/CeO 2 were greatly enhanced by La doping, which accelerated ethanol conversion, promoted H 2 yield, and maintained good longeterm activity for the OSR reaction.

show abstract

“…These observations led to the outstanding attention on the catalytic properties of the Co/ceria system in ethanol transformation reactions, including SRE. 12,[17][18][19][20][21][22][23][24][25][26][27][28] Very recently we have found that trace amounts of Rh promoter (0.1 wt%-0.17 mol%) dramatically altered the reaction pathways of SRE on Co/ceria catalysts. In contrast to Co/ceria, on rhodium-containing Co/ceria catalysts no acetone was observed.…”

Section: +mentioning

confidence: 99%

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Varga

Pusztai

Óvári³

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The interaction of CeO 2 -supported Rh, Co and bimetallic Rh-Co nanoparticles, which are active catalysts in hydrogen production via steam reforming of ethanol, a process related to renewable energy generation, was studied by X-ray diffraction (XRD), high resolution electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and low energy ion scattering (LEIS). Furthermore, diffuse reflectance infrared spectroscopy (DRIFTS) of adsorbed CO as a probe molecule was used to characterize the morphology of metal particles. At small loadings (0.1%), Rh is in a much dispersed state on ceria, while at higher contents (1-5%), Rh forms 2-8 nm particles. Between 473-673 K pronounced oxygen transfer from ceria to Rh is observed and at 773 K significant agglomeration of Rh occurs. On reduced ceria, XPS indicates a possible electron transfer from Rh to ceria. The formation of smaller ceria crystallites upon loading with Co was concluded from XRD and HRTEM; for 10% Co, the CeO 2 particle size decreased from 27.6 to 10.7 nm. A strong dissolution of Co into ceria and a certain extent of encapsulation by ceria were deduced by XRD, XPS and LEIS. In the bimetallic system, the presence of Rh enhances the reduction of cobalt and ceria.During thermal treatments, reoxidation of Co occurs, and Rh agglomeration as well as oxygen migration from ceria to Rh are hindered in the presence of cobalt.

show abstract

The effect of support reducibility on the stability of Co/CeO2 for the oxidative steam reforming of ethanol

Cited by 75 publications

References 26 publications

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

Hydrogen production from oxidative steam reforming of ethanol over rhodium catalysts supported on Ce–La solid solution

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Contact Info

Product

Resources

About

The effect of support reducibility on the stability of Co/CeO2 for the oxidative steam reforming of ethanol

Cited by 75 publications

References 26 publications

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

Hydrogen production from oxidative steam reforming of ethanol over rhodium catalysts supported on Ce–La solid solution

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO2 support: catalytic materials for alternative energy generation

Contact Info

Product

Resources

About

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation